hadith Islam has been built on five pillars

a man came to Prophet Muhammad (ﷺ) and said: Messenger of Allah, what is Islam? Muhammad (ﷺ) replied: You must not associate anything with Allah/God, and establish prayer, pay the poor-rate (Zakat) and observe (the fasts) of Ramadan.

Reference Muslim » The Book of Faith » Hadith 7

Islam has been built on five pillars:

• 1- testifying that there is no god but Allah and that Muhammad is the Messenger of Allah
• -2- performing the prayers
• -3- paying the Zakah
• -4- fasting in Ramadan
• -5- making the pilgrimage to Mecca

— Prophet Muhammad (ﷺ)

Reference al-Bukhari » Book of Belief » Hadith 1

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Suzanne Haneef is an American convert to Islam she wrote two wonderful books i have read them both. here the links:

1- What Everyone Should Know About Islam and Muslims by Suzanne Haneef PDF

http://www.islamicbulletin.org/free_downloads/new_muslim/what_everyone.pdf

2- Islam: The Path of God By Suzanne Haneef PDF

http://www.islamicbulletin.org/free_downloads/new_muslim/islam_the_path.pdf

Allah knows best.